at 800.974.6006 tty/v it's simple but somewhat diabolical. Create an online profile of a beautiful woman whose personal information indicate she's cruel and stupid. Would men respond anyway? Reporter: She's cold aaron carter fan and she's the most monstrous online dater imaginable. She is mean and manipulative. She gets her kicks knocking cups out of the hands of homeless, fools boy friends into thinking she's pregnant. Her ambition is to design dog clothing. But she sure is pretty. I wanted to see if there was a lower limit to how awful a human being could be before men would not message her onkaline dating sites. Ally reid who created this monster is a comedy writer and disillusioned online dater. I put it up hoping no one would message her and she got 150 messages in the first 24 hours. Their brains are wired to be visual. You're visual biologically. I don't think that you should be chastised for something that how you're physically built. And let's be fair here. Only one in ten of the men who viewed the profile sent a message. But about 1,000 men sent messages and ally replied. I told men I will pretend to be pregnant so I can sue you for child support. And did they -- responded saying sounds great, what did you do this friday? Many men are fascinated by a challenge. And I think that chase of potentially changing her or even just getting her is appealing. . Reporter: Okay cupid is the site where our pretty monster enjoyed such success. I got a lot of phone numbers. Real human male phone numb befrs. And okay cupid actually told us a few years ago that women who show a little clooeavage in the profile photo showed 79% more success. I get that men are visually wired that way. Reporter: So if you're attracted to the awful aaron carter fan, after everything we've said, it's not your fault. You're just a man. I'm nick watt for "nightline" in los angeles.

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